.relative{
    position:relative;
}
.absolute{
    position:absolute;
}
.fixed{
    position:fixed;
}
.t0{
    top:0rem;
}
.l0{
    left:0rem;
}
.r0{
    right:0rem;
}
.b0{
    bottom:0rem;
}
//position函数
@positionList:1,2,3,4,5,6,7,8,9,10,15,20,24,30,40,48,50,75,80,90,100;
.posi-loop(@list,@i:1,@val:extract(@list,@i)) when (length(@list)>=@i){
    .t@{val}{
        top:extract(@list,@i)/10rem;
    }
    .l@{val}{
        left:extract(@list,@i)/10rem;
    }
    .r@{val}{
        right:extract(@list,@i)/10rem;
    }
    .b@{val}{
        bottom:extract(@list,@i)/10rem;
    }
    .posi-loop(@list,(@i+1));
}
.posi-loop(@positionList);

